from what i can tell, PBR is what marmoset is all about. so I doubt it. at least I never saw the ability to. since it is a PBR based renderer. there are other options though.
Marmoset tb2 uses a different kind of rendering, "physically based rendering". It requires different maps but produces better results. Here's a tutorial and the theory behind it. I suggest you read both thoroughly. : http://www.marmoset.co/toolbag/learn/pbr-theory http://www.marmoset.co/toolbag/learn/pbr-practice Your…
[ame="http://www.youtube.com/watch?v=LNwMJeWFr0U"]Physically Based Rendering for Artists - YouTube[/ame] Here you have great stuff about pbr. Your model looks good for a learning experience.
There are ways of getting the original marmoset, which I think is still pretty useful if you're texturing for non-pbr engines. @luge: Try disabling the sky background for your renders, it makes the knife stand out more. The textures are looking better, but I'd try to add some oily smudges to break up the even noise.